MHT CET 2023 Physics question
Two long conductors separated by a distance 'd' carry currents and in the same direction. They exert a force 'F' on each other. Now the current in one of them is increased to two times and its direction is reversed. The distance between them is also increased to 3d. The new value of force between them is
Answer: (C)
Solution
The force per unit length between two long parallel currents is (attractive for currents in the same direction, taken as positive). In the new situation with reversed direction, so the product of currents becomes , and .
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